Warp stop mechanism for looms



June 9, 1925-.

C. D. BROWN WARP STOP MECHANISM FOR LOCMS Filed M12. 1924 .3 SheetsShee't 1 'June 9, 1925.

C. D. BROWN WARP STOP MECHANISM FOR LOOMS Filed Aug. 1924 5 Sheets-Sheet '2 ATTORNEY June 9,1925. v c. D. BROWN WARP STOP MECHANISM FOR LOOMS Fil ed Aug.

1924 3 Sheets-Sheet 5 ATTORNEY Patented June 9, 1925.

ED, T S PATENT were CARL n. BROWN, or Hermann, nassacnusnr'rs, AssIeNoa To mama consona- TION, or Hermann,nassaonusnrrs, a CQBPORATION or'MAINE.

WARP STOP MECHANISM FOR LOOMS.

Application filed August 2, 1924. Serial 1%. 729,770. 5

tion, inconnection with the accompanying drawings, is a specification, like characters on the drawings representing hkeparts. TlllS nive'ntlon relates to warp stop mechanislns for stopping the loom when a warp thread breaks or becomes too slack for weaving purposes. f

As now ordinarily constructed, mechanical warp stop mechanisms comprise a series of drop wires and a detector which is given a detecting movement and is arrested in this movement when a drop wire lalls to be supported by a warp threadj T he strain placed upon the unsupported drop wire in arresting inovementof the detector frequently causes injury to the drop wire through the ariztuating strain, because the drop. wires themselves are usually made 0t light ma,

terial and are consequently easily injured. In this ordinary type of warp stop mechanism, also, the drop wire guide for guidingthe dropwires in their movements frequently becomes bent due to the strain placed uponthe drop wire guide when the lOUH'iiS to be. stopped V i in the ordinary warp "stop mechanisms now muse lintfrequently accunnllates on the drop wire guide and on the detector, with the result that nnpalred actlon of the parts frequently ensues.

Still another factor in the use of a warp stop mechanism as now ordinarily con- 'structedis that the warp beam must beset bacli in order to ha-ve the proper" stretch from the stop motion to the back harness.

The present invention seeks to overcome the difiiculties and object-ions heretofor'eencountered in warp stop mechanisms, and an. in'iportant feature of the present invention consists inlneans actuated byadrop i wii 'e when it ttailshto be supported by a warp thread duringweavlng' tor the actuusuallyy transmit-ted ation of a lock which operates to lock the detector to avh'xed part of the loom, there by relievingthe stopping strain heretotore it'self: i i

directly" to the drop Another important feature of the invention consists in a drop wireengaging member of the detector, sufficiently yieldable to prevent injury to the drop wire, and yet sul'iiciently stable to effect operation of the lock by the drop wire; and a still further important feature, of the invention consists in a drop wire guide which will flex or yield under the disturbing influence of a drop wire when it is in stopping position, and

when the strain is removed.

In accordance with thewpresent invention,

will resume its straight or unbentcondition the wire engaging member'of the detector 7 and drop wire guide, either one or both, is preferably tormed as a yielding spring whlcl'rwill tend to assume its originalposi- ,tion after having been deflected by a drop wire.

v More specifically stated, the engaging member of the detector-and the drop wire guide is preferably formed of a coiled wire spring which is expansible and contractable, so that when a drop wire fails to be supported by a warp thread and it has dropped into engagement with the drop wire guide, it will rest on or between the convolutions of the coil,so that by longitudinal expansion of the drop wire guide the position of the defective warp thread is; at once ascertained.

The above and other new features of the invention and novel combination of parts will best he made clear from the following description and the accompanying drawings of one good form thereof. 4

1n the drawings: y

Fig; 1 is a fore-and-aft section through a 100m containing the present invention;

2 is an enlarged perspective detail showing a warp stop mechanism containing the present invention; Fig. 3 is an enlarged cross-section of the main portion of the warp stop mechanism, showing more particularly oneform of the detector lock;

Fig. 4; is a perspective detail showing the invention as associatedwith the hair-pin type of drop wire and the condition that ensues when a drop, wire fails to be supportedby a warp thread; r

Fig. 5, is a perspective view showing one form pf the detector and its associated parts;

' however, is shown. be secured to the bracket 22 adjustably by shaft 26.

convenient form of means for detachably connecting either the drop Wire guide and end supports or the ends of the flexible or yielding drop wire engaging member of the detector; and

Fig. 7 is a cross-sectional view on an enlarged scale showing a modified form of the detector lock.

The warp stop mechanism of the present invention may be associated with any type of transmission mechanism for stopping the loom when the detector is stopped in its movement by being locked to a fixed part, but in the present instance the loom frame 1 has mounted thereon the usual shi )per 2 against which bears the end 3 of a crank lever 4 pivoted at a near the shipper '2. The crank of the lever 4 is connected at 6 with a transmitter 7, movement of which to the left, Fig. 1, will cause the shipper to be detached from its holding notch and the loom be stopped. I

The lay 8 has adjustably mounted thereof the hunter 9 which is adapted at times to engage with the end of the dog, as will be explained.

Rising from the loom frame a supporting bracket 10 in which the shaft 11. is mounted for rocking movement. The outer end of the shaft 11 is secured to a slotted lifter 12, Fig. '2, into the slot of which projects a pin 13 extending; from the dog 14 which is iarried by the shaft ii. I s shown, the dog 14 has a slot 15 through which the shaft 11 projects, the construction being such that should the dog; he struck by the hunter 9 it may be moved thereby to effect loom stoppage. Also mounted on the shaft 11 is the arm 16 through the slot of which, similar to the slot 15 of the dog, extends the shaft 11. The arm 16 has an arcnate slot- 17 into which extends a pin 18 from the dog 14, the construction being such that should the dog 14 be lifted into the path of the hunter 9, as the lay moves back, both the dog and the arm 16 will be moved reaiwvardly, as shown, and thereby draw rearwardly on the transmitter 7 which is connected at 19 to the arm .16.

Secured to the rock shaft 11 is an arm 20 to which is pivotally connected the rod 21 which is under control of the main portions of the warp stop mechanism as will appear. I

Mounted at each side of the loom on a bracket 22 are the end frames of the main warp stop mechanism, only one of which, The end frame 23 may the bolt and slot connection 24.

Mounted in extensions 25 of the end frames 23 is a rock shaft 26 on which is loosely mounted the cam 27, Fig. 2, which engages a projeflion 28 secured to the rock The projection 2,8 and cam 27 have interengaging cam surfaces, and the loose cam 27 is normally pressed into engagement with the projection or cam 28 by a spring 29 interposed between a collar 30 secured to the rock shaft 26 and the cam 27. The cam 27 has a lug or arm 31 to the outer end of which is connected the operating rod 32 which may be actuated from any goingpart of the loom, not herein shown, because it is well understood by those familiar with warp stop mechanisms that the actuating roo is given its endwise movement by suitable means, such as a cam.

hfounted on the stud extending; upwardly from the extension 25 is a rocking sleeve 34 carrying an arm which is connected to the transmitter 21 at 36. The sleeve 34 has another arm 37, Fig. 2, angularly disposed relative to the arm and connected to a rod 38, the other end of which is secured to the cam 27, the construction being such that should the rock shaft 26 be arrested in its rocking movement while the cam 27 continues to be actuated, the cam 27 will be moved endwise on the rock shaft 26 and through the rod 38 and connections described, position the dog 14 to be struck by the hunter 9 as the lay moves back.

The rocking movement of the rock shaft 26 is utilized in the present invention for imparting detecting movements to the detector, and as shown, Fig. 2, the shaft 26 has an arm 39 extended therefrom which is connected by a rod 40 to the detector frame,

the construction being such that rocking movement of the rock shaft 26 will impart a to-and-fro movement to the detector.

Extending downwardly from the bracket or projection 25 is a lug 41 to which is rigidly secured a support 42 on which the detector moves.

The detector or detector frame is of novel c mstructiorn shown more particularly in Figs. 3 and In the present instance of the invention, the detector frame comprises the cross-bars 43, 44 which are shown as formed of angle iron, but of course they may be variously contrived. Secured to and extending upwardly from the cross-bars 43 and 44 is a saddle through the opening 46 of which extends the support 42. The number of saddles,'and consequently, the number of supports for the dete tor frame may vary, but in the present instance of the invention, as indicated in Fig. 5, four of such saddles are shown, and more or less may be used in accordance with the width of the loom and the consequent size of the detector frame.

The detector bars 43 and 44 have interposed therebetween suitable spacers which permit either of the detector bars to tilt or move angularly relative to the other, In the present instance of the invention, where the detector bars are formed of sheet metal or angle iron, as shown, each bar has ill) Inn

When a drop wire tails to be supported by a warp thread, it will take the position of the lower drop wire, indicated in Fig. 3, and will contact with the flexible wire constituting the engaging member otthe detector and thereby operate the lock to lock the (etector to a fi:-:ed part of the loom. At such time the upper end portion of the drop wire through the slot 67 of which the drop wire guide extends, will engage the convolutions of the drop wire guide, and at such time should the drop wire guide be detached from its end support and pulled lengthwise, it will separate the fallen drop wire from its associates and indicate the warp tault. So, also, when the end of the flexible drop wire guide is engaged with its support, the contracting force of the coiled wire will cause the drop wire guide to contract, and hold the drop wire guide in position by the contractile force of the spring. So, also, should the drop wire guide be deflected or bent, its flexible and yielding nature will permit it to automatically straighten under the contractile force of the spring.

In some cases it may be desired to use the hair-pin type of drop wire, as indicated in Fig. 4, wherein the drop wire 68 has an opening 69 for'the coiled spring drop wire guide 70, and its lower end portion 71 s formed of two legs unconnected at their lower ends. Such form of drop wire may be supported by the warp thread a by passing the latter through the upper port on of the slot separating the lower leg portion of the drop wire, as indicated in Fig. 4;.

hen the hair-pin form of drop wire is employed and fails to be supported by a warp thread, its lower leg portion will be engaged by the coiled wire constituting the drop wire engaging member of the detector, as indicated in Fig. 4, but the yielding nature of such dectector is such that it will. not injuriously distort the hair-pin drop wire but will deflect it somewhat, as indicatcd in Fig. 4, to indicate the position of the war thread. I

Fig. as hereinbetore stated, shows a modified term of the detector lock in which,

instead otthe pin or roller 51 and the upper edge portion 52 of the detector bars engaging the fixed support on which the detector has its detecting movement, each detectorbar, otherwise similar to that already descr bed, has the lock formed by upwardly extending wing portions 72 which are secured to each of the detector bars. Adjacent to the upwardly extending end portions 72 ot the modified form'of lock is a serrated bar 73 which may be conveniently secured above the detector and warp supports 62, the construction being such that should a drop wire tail to be supported by its warp thread, it will, as in the preferred form of the invention, cause one of the detector bars 43, 14 to be tilted to thereby actuate the lock and cause the end portion 72 thereof to engage and be held by the fixed toothed bar 73.

A troublesome factor in the warp stop mechanisms for looms is the accumulation of lint on the moving parts, especially on the drop wire engaging member, the drop wire guides or drop wire, but in conformity with the present invention the drop wire guides and drop wire engaging member of the detector afi'ord ready means for shedding any lint that may accumulate thereon and for discharging such lint by the expansive and contractile movement of the springs which form such parts.

What is claimed is:

1. In a mechanical warp stop mechanism for looms, the combination of a series of drop wires normally supported by the warp threads during weaving, a drop wire de tector having a detecting movement, means actuated by the drop wire when it fails to be supported by a warp thread for securing the detector to a fixed part to thereby arrest its detecting movement, and means for stopping the loom when the detector is secured to-the fixed part and its movement is thereby arrested.

2. In a mechanical warp stop mechanism for looms, the combination of a series of drop wires normally supported by the warp threads during weaving, a drop wire detector having a detecting movement, a detector lock which is actuated by a drop wire when it fails to be. supported by a warp thread for connecting the detector im movably to a fixed part to thereby arrest detecting movement of the detector, and means for stopping the loom when the de tector is locked to the fixed part and its movement is thereby arrested.

3. in a mechanical warp stop mechanism for looms, the combination of a series ol drop wires normally supported by the warp threads during weaving, a drop wire detector having a detecting movement, a detector lock movable with the detector and actuated by a drop wire when it fails to be supported by a warp thread for locking the detector to a fixed part to thereby arrest the detecting movement of the detector, and means for stopping the loom when the detector is locked to the fixed part and its movement is thereby arrested.

'4. In a mechanical warp stop mechanism for looms, the combination of aseries oi drop wires normally supported by the warp threads during weaving, a drop wire detector having a detecting movement, a detector lock carried by the detector and actuated by a drop wire when it fails to be supported by a warp thread, a fixed part with which the lock engages when actuated by a drop wire to thereby arrest detecting niove'n'ient of the detector and relieve the strain on the drop wire, and means for stopping the loom when the detector movement is arrested. i

c 5. A warp stop motion detector having a detectingmovement and a detector lock for connectingthe detector to a relatively. fixed part tothereby arrest its detecting movement and relieve the drop wire when it fails to be supported by a warp thread.

6. warp stop motion detector having'a detecting movement, a lock for securingthe detector to a fixed part,- and a drop wire for actuating the lock to thereby arrest movement of the detector and. relieve strain upon the drop wire.

7,, In a warp stop mechanism for looms, the combination of a series of drop wires, a drop wire detector having a detecting movementband COInpIflSing a yielding member adapted to engage a drop wire when it fails to besupported by a warp thread, and a lock actuated through said yielding member tolock the detector to a fixed part to thereby arrest its movement, and means for stopping the loom when the detector is locked toithe fixed part... p c c 8. A warp stop motion detector comprising a ,frame, a lock mounted on the frame for movement into and out of locking position, means normally acting to hold the lock out of locking position, a fixed member adapted to be engaged by said look when. moved into locking position, and a series of drop wires normally supported by the warp threads during weaving and adapted to move the lock to locking position into engagement with the fixed member when a drop wire fails to be supported bya warpthread during movement of the detector that the fixed member may take the stopping strain off th drop wire.

9. A detector for mechanical warp stop mechanisms, comprising a frame having detectingmovement, a support for said frame relative to which it has a tilting movement when a drop wire fails to be supported by the warp thread, and a lock carried by the frame for engagement with a fixed part to arrest. the detecting movement of the detector when the frame is tilted on its. support to thereby relieve the strain on the drop wire.

10. In a warp stop mechanism for looms, the combination of a series of drop wires normally supported by the warp threads during weaving, a detector having a detecting movement and provided with a yielding drop wire engaging member formed as a coiled spring, and means for stopping the loom when a drop wire fails to be supported by a warp thread during weaving.

11. In a warp stop mechanism for looms, the combination. of a series of drop wires normally supported by the warp threads during weaving, a detector having a detecting movement and provided with a yielding drop wire engaging member formed as a coiled spring, means for stopping the loom when adrop wire fails to be supported by a warp thread during weaving, and a lock which is actuated to lock the detector and arrest its movement when the coiled spring 7 engages adrop wire.

12. A detector for mechanical warp stop mechanism, comprising a detector frame, means for imparting a detecting movement to. said frame, a relatively yielding drop wire engaging member carried by the detector frame for yieldingly engaging a drop wire when it fails to be supported by a warp thread, and means actuated by the yielding drop wire engaging member for arresting movement 01' the detector frame.

13. A detector for mechanical warp stop mechanism for looms, comprising a frame, and an expansion and contraction.spring carried by the frame and constituting the drop wire engaging member of the detector.

14;. A detector for mechanical warp stop mechanism for looms, comprising a frame an expansion and contraction spring carried by the frame and constituting the drop wire engaging member of the detector, and means for securing the expansion spring to the frame by the contractile force of the spring.

15. In a warp stop mechanism for looms, the combination of a series of drop wires normally supported by the warp threads during weaving, a drop wire guide for guid- I 1 ing the drop wires, a detector having an expansion spring constituting the drop wire engaging member of the detector, and means for stopping the loom when the detector is arrested in its detecting movement.

16. In a warp stop mechanism for looms, the combination of a series of drop wires normally supported by the warp threads during weaving, a drop wire guide for guiding the drop Wires formed as an expansion spring, a detector having an expansion spring constituting the drop wire engaging member of the detector, and means for stopping the loom when the detector is arrested in its detecting movement.

17. In a warp stop mechanism for looms, a drop wire guide formed as a coiled spring for engaging a drop wire when it fails to be supported by a warp thread and for locating such unsupported drop wire by deflection of the spring.

18. In a warp stop mechanism for looms,

the combination of a supporting frame, a

he combination of a series of drop wires normally supported by the warp threads during weaving, a drop wire guide, -a detector having a detecting movement and provided with a drop wire engaging member constituted as a coiled spring which yields laterally when a drop wire fails to be supported by a warp thread and is engaged by the drop wire engaging member.

20. In a warp stop mechanism for looms, the combination of a series of drop wires normally supported by the warp threads during weaving, a drop wire detector, a lined support on which the detector has a detecting movement, a lock which is actuated by a drop wire when it fails to be supported by a warp thread to lock the detector to its i'ixed support and thereby arrest its detecting movement to relieve the drop wire from strain, and means for stopping the loom when the detector is locked to its support.

21. In a warp stop mechanism for looms, the combination of a series of drop wires normally supported by the warp threads durii'ig weaving, a drop wire detector, a rocker connected to the detector for imparting detecting movements thereto, a projection fixed to the rocker, a cam loosely mounted on the rocker and engaging said projec- W tion, means for operating the cam and through it the rocker, a lever having posi tive connection with the cam and actuated by the cam to effect loom stoppage when the drop wire detector is arrested in its movement by a drop wire.

22. In a warp stop mechanism for looms the combination of a series of drop wires, a detector having a detecting movement and provided with a relatively elastic drop Wire engaging member, and means for stopping the loom when a drop wire fails to be supported by a warp thread during weaving.

In a mechanical warp stop mechanism for looms, a detector having a detecting movement and provided with a spring constituting the drop wire engaging member of the detector.

2%. In a warp stop mechanism for looms, the combination of a series of drop wires, a

drop wire detector, means for imparting reciprocating detecting movement to the detector, a locking member movable with the detector and actuated to connect the detector iimnovably to a fixed part to arrest detecting movement of the detector and relieve the strain on the drop wire when it fails to be supported by a warp thread.

In testimony whereof, I have signed my name to this specification.

CARL D. BROWVN. 

